$1+x+xy-2+2x-xy-3+2xy-3x$

$sec\left(x\right)\left(1-sin^2\left(x\right)\right)$

$\frac{dy}{dx}=e^{x-y},\:y\left(0\right)=ln\:3$

$\lim_{x\to\infty}\:x\:\:cotx$

$\int\left(\frac{x^{\frac{3}{2}}-x^{\frac{1}{3}}}{12x^{\frac{1}{4}}}\right)dx$

$1-\frac{x}{x}$

$3\left(4h+2k\right)$